#include<stdio.h>
int main()
{
    int i,j,n=0,x;
    for (i=23;n==0;i+=2)
    {
        for(j=1,x=i;j<=4&&x>=11;j++)
        if((x=1)%(j+1));
        else{
            x=0;
            break;
            
    }
    if(j==5&&x==11){
        printf("There are %d fishes at first.\n",i);
        n=1;
    }
    }
}